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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#signals-and-slots">Signals and Slots</a></li>
<li class="level2"><a href="#introduction">Introduction</a></li>
<li class="level1"><a href="#qt-object-model">Qt Object Model</a></li>
<li class="level1"><a href="#layout-classes">Layout Classes</a></li>
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<h1 class="title">Core Features</h1>
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<h2 id="signals-and-slots">Signals and Slots</h2>
<p>Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks.</p>
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<h3 id="introduction">Introduction</h3>
<p>In GUI programming, when we ..&#x2e;</p>
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<h2 id="qt-object-model">Qt Object Model</h2>
<p>The standard C++ object model provides very efficient runtime support for the object paradigm. But its static nature is inflexibile in certain problem domains. Graphical user interface programming is a domain that requires both runtime efficiency and a high level of flexibility. Qt provides this, by combining the speed of C++ with the flexibility of the Qt Object Model.</p>
<p>...</p>
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<h2 id="layout-classes">Layout Classes</h2>
<p>The Qt layout system provides a simple and powerful way of specifying the layout of child widgets.</p>
<p>By specifying the logical layout once, you get the following benefits:</p>
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<li>Positioning of child widgets.</li>
<li>Sensible default sizes for windows.</li>
<li>Sensible minimum sizes for windows.</li>
<li>...</li>
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